On the basis of generally stereotactic radiotherapy technology, intensity modulated radiation therapy technology has been developed greatly since l990's.

强度可调的适形放射治疗是上世纪90年代在适形放射治疗基础上发展起来的一种精确的放射治疗方法。

Radiation therapy affects the cancer cells only in the treated area.

放射治疗影响仅癌细胞在被对待的区域。

Objective To evaluate the results and side effects in three dimensional conformal radiation therapy(3DCRT) for esophageal carcinoma.

目的探讨三维适形放射治疗（3DCRT）食管癌的疗效及放射治疗反应。

This is because they may have had a large dose of radiation therapy on the chest.

这是因为他们可能有大剂量放射治疗胸部。

Objective To compare dosimetry of different radiation therapy plans for breast cancer.

目的研究乳腺癌不同放射治疗计划的剂量学差异。

Radiotherapy instruments are used for the treatment of tumor by ionizing radiation, mainly including stereotactic radiation therapy;

放射治疗仪器是利用电离辐射对肿瘤进行治疗的装置；

The way the radiation therapy is given depends on the type and stage of the cancer being treated.

放射治疗的方式取决于被治疗的癌症的类型和癌症所处的阶段。

Side effects of radiation therapy depend mainly on the dose and the part of the body that is treated.

放射治疗的副作用主要取决于药物剂量和接受治疗的机体的部分。

The treatments may include drug therapy, monoclonal antibody therapy, stem cell transplantation , and radiation therapy for some patients.

这些治疗包括药物治疗、单克隆抗体治疗、干细胞移植，以及针对某些患者的放射治疗。

Treatment plan optimization is one of important step in radiation therapy which adopt multiple X - ray beams.

在采用多射线束的放射治疗中,治疗计划优化是一个重要的步骤.